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Comparison of Left 4Th and 5Th Intercostal Space Thoracotomy for Open-Chest Cardiopulmonary Resuscitation in Dogs

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Comparison of Left 4Th and 5Th Intercostal Space Thoracotomy for Open-Chest Cardiopulmonary Resuscitation in Dogs COMPARISON OF LEFT 4TH AND 5TH INTERCOSTAL SPACE THORACOTOMY FOR OPEN-CHEST CARDIOPULMONARY RESUSCITATION IN DOGS _______________________________________ A Thesis presented to the Faculty of the Graduate School at the University of Missouri-Columbia _______________________________________________________ In Partial Fulfillment of the Requirements for the Degree Master of Science _____________________________________________________ by ANUSHRI WARANG Dr. Fred Anthony Mann, Thesis Supervisor JULY 2018 The undersigned, appointed by the dean of the Graduate School, have examined the thesis entitled COMPARISON OF LEFT 4TH AND 5TH INTERCOSTAL SPACE THORACOTOMY FOR OPEN-CHEST CARDIOPULMONARY RESUSCITATION IN DOGS presented by Anushri Warang, a candidate for the degree of Master of Science, and hereby certify that, in their opinion, it is worthy of acceptance. F. A. Mann, DVM, MS, Diplomate ACVS, Diplomate ACVECC J. R. Middleton, DVM, PhD, Diplomate ACVIM-Large Animal Internal Medicine Colette Wagner-Mann, DVM, PhD Keith Branson, DVM, MS, Diplomate ACVAA DEDICATION I dedicate this work to my family and friends, in India and in the United States. Mom, thank you for sending me warm good morning wishes every single day. They brighten up my whole day and work better than my morning gallon of coffee. Dad, thank you for sending me photos of family gatherings and holiday decorations. And thanks for sending me photos of those beautiful hibiscus flowers on the window sills as they bloom throughout the year. They make me nostalgic even more than the family photos! I explicitly do not want to thank my brother who has never shown any interest in anything I’ve done in the entirety of my life; but who keeps sending me cat videos, that he shot himself, every week like clockwork. (Seriously bro, stop stalking cats!) I would also like to thank all my cousins for discussing everything under the sun in group chats. I absolutely needed to know about all those dinner plans (without me!) and everybody’s ETA! Finally, I thank all my friends for never forgetting my birthday, offering a listening ear when I needed it and tolerating me when I would ramble on about my master’s program; especially those here in Columbia. Much love! Being away from loved ones has been difficult, but all of you have made it so much easier, one good morning wish, one photo, one cat video and one text message at a time. I wish you all the health and happiness in the world. ACKNOWLEDGEMENTS I would like to acknowledge my mentor Dr. Tony Mann, for all his support and encouragement throughout my graduate program. Dr. Mann was instrumental in my decision to come to the United States to improve my knowledge and skills and broaden my horizons. His patience and motivation was the foundation over which rested the whole of my program. I would like to acknowledge Dr. John Middleton for his help with the statistics for my research. He was extremely patient in explaining complicated statistical concepts to me and was always available for discussions whenever needed. I would also like to acknowledge Dr. Colette Wagner-Mann for advising me during the planning stage of my research. Dr. Wagner-Mann was extremely generous to allow me to use her laboratory for data collection and I couldn’t have finished it smoothly without her help and guidance. I would like to acknowledge Dr. Keith Branson for suggestions and ideas for my research. His input helped a lot and it was insightful and helped me fine tune my project. Finally, I would like to thank Dr. Kimberly Aeschlimann, Dr. Heather Honious, Dr. Nicole Trenholme, and Dr. Kaoru Tsuruta for helping me through the data collection process for my research. ii TABLE OF CONTENTS LIST OF TABLES………………………………………………………..………........….v LIST OF FIGURES…………………………………………………………….....….......ix LIST OF ABBREVIATIONS………………………………………………………....…..x ABSTRACT…………………………………………………………...………………....xi Chapters 1. INTRODUCTION……………………………………………………………..……….1 Open-chest cardiopulmonary resuscitation Technique for clamshell approach and impracticality for canine patients Historic background of open-chest cardiopulmonary resuscitation Surgical approaches for performing thoracotomy in veterinary patients Rationale behind study design Objective and hypothesis of study 2. MATERIALS AND METHODS……………………………………………..……….17 Sample Population Procedure Observations Training of evaluators Preparation of Rumel tourniquet Preparation of cadavers iii Shingling Data collection Data analysis 3. RESULTS……………………………………………………………………..………26 (i) Ease of access of phrenicopericardial ligament Number of sweeps (ii) Ease of pericardial incision (iii) Ease of hand position (iv) Ease of aortic access Time to visualization of the aorta (v) Ease of application of Rumel tourniquet Time to placement of Rumel tourniquet (vi) Ease of paddle placement Time to placement of defibrillator paddles 4. DISCUSSION…………………………………………………………………………30 5. FUTURE DIRECTIVES………………………………………………………………36 APPENDIX 1. Tables…………………………………………...…………………………………….37 2. Figures………………………………………………………………………………...58 3. References………………………………………………………………….……...….67 iv LIST OF TABLES Table 1. Signalment of cadavers (n=12) used to compare left 4th and 5th intercostal spaces for open-chest cardiopulmonary resuscitation techniques……………………….....……37 Table 2. Width of thoracotomy incision for open-chest cardiopulmonary resuscitation on canine cadavers (n=6 for 4th intercostal space, n=6 for 5th intercostal space), measured from cranial to caudal in the center (widest part of the incision, measured between the blades of Balfour retractors) of the intercostal space incision with Balfour retractors extended maximally………………………………………………………….……..……38 Table 3. Ease of grasping the phrenicopericardial ligament, number of sweeps needed to grasp the phrenicopericardial ligament, and ease of pericardial incision via a left 4th or 5th intercostal space (ICS) thoracotomy in canine cadavers (n=6 for 4th ICS, n=6 for 5th ICS) as performed by each evaluator (A, B, C) using a scale of 0 to 10, where 0 was easiest and 10 was most difficult..…………………………………………………….…………39 Table 4. Ease of achieving appropriate hand position to perform cardiac massage via a left 4th or 5th intercostal space (ICS) thoracotomy on canine cadavers (n=6 for 4th ICS, n=6 for 5th ICS) as performed by three evaluators using a scale of 0 to 10, where 0 was easiest and 10 was most difficult.………………………………………...………………………….……………..40 Table 5. Ease of aortic access via a left 4th or 5th intercostal space (ICS) thoracotomy on canine cadavers (n=6 for 4th ICS, n=6 for 5th ICS) as performed by three evaluators using a scale of 0 to 10, where 0 was easiest and 10 was most difficult.….………..…….……41 v Table 6. Time from handing right angle forceps to visualization of aorta (seconds) via a left 4th or 5th intercostal space (ICS) thoracotomy on canine cadavers (n=6 for 4th ICS, n=6 for 5th ICS) as performed by three evaluators.…………………………...….………42 Table 7. Ease of application of Rumel tourniquet via a left 4th or 5th intercostal space (ICS) thoracotomy on canine cadavers (n=6 for 4th ICS, n=6 for 5th ICS) as performed by three evaluators using a scale of 0 to 10, where 0 was easiest and 10 was most difficult…………………………………………………………………………………...43 Table 8. Time (seconds) from handing mosquito forceps to application of Rumel tourniquet via a left 4th or 5th intercostal space (ICS) thoracotomy on canine cadavers (n=6 for 4th ICS, n=6 for 5th ICS) as performed by three evaluators………………….…44 Table 9. Ease of defibrillator paddle placement around the heart via a left 4th or 5th intercostal space (ICS) thoracotomy on canine cadavers (n=6 for 4th ICS, n=6 for 5th ICS) as performed by three evaluators using a scale of 0 to 10, where 0 was easiest and 10 was most difficult……..............................................................................................................45 Table 10. Time (seconds) from handing paddles to appropriate paddle placement via a left 4th or 5th intercostal space (ICS) thoracotomy on canine cadavers (n=6 for 4th ICS, n=6 for 5th ICS) as performed by three evaluators.……………………………...…….....46 Table 11. Post shingling ease of achieving appropriate hand position to perform cardiac massage via a left 4th or 5th intercostal space (ICS) thoracotomy in canine cadavers (n=6 for 4th ICS, n=6 for 5th ICS) as performed by three evaluators using a scale of 0 to 10, where 0 was easiest and 10 was most difficult………………………………………......47 vi Table 12. Post shingling ease of aortic access via a left 4th or 5th intercostal space (ICS) thoracotomy in canine cadavers (n=6 for 4th ICS, n=6 for 5th ICS) as performed by three evaluators using a scale of 0 to 10, where 0 was easiest and 10 was most difficult…..…48 Table 13. Post shingling time (seconds) from handing right angle forceps to visualization of aorta via a left 4th or 5th intercostal space (ICS) thoracotomy in canine cadavers (n=6 for 4th ICS, n=6 for 5th ICS) as performed by three evaluators……………………..……49 Table 14. Post shingling ease of application of Rumel tourniquet via a left 4th or 5th intercostal space (ICS) thoracotomy in canine cadavers (n=6 for 4th ICS, n=6 for 5th ICS) as performed by three evaluators using a scale of 0 to 10, where 0 was easiest and 10 was most difficult……………………………………………………………………….…….50 Table 15. Post shingling time (seconds) from handing mosquito forceps to application of Rumel tourniquet via a left 4th or 5th intercostal space (ICS) thoracotomy in canine cadavers (n=6 for 4th ICS, n=6 for 5th ICS) as performed by three evaluators.……...…..51
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